We have been told by Ms Hawking that the Island is always moving.
the nature of the movement of the Island is 4-Dimensional : it is moving through Space-Time, since Ben dislodged the Donkey Wheel from it's axis when he left the Island.
but Locke fixed the Donkey Wheel so it is no longer moving through Space-Time.
but this seems to be a paradox : either the Island is always moving through Space and Time or it is never moving through Space and Time.
but this only seems to be a paradox because though the Island always moves through Space and Time it moves in quantum leaps. there are periods of Space and Time where the Island is not moving.
from 1974 to 1977 the Island is just an Island sitting still in Space-Time.
it is the 30 years older version of the Island that is jumping around in Space and Time. but the movements are for a short period of relative time.
any questions ?